Federal law is “the supreme Law of the Land.” That line from the Supremacy Clause gets quoted like it settles every federalism fight on the spot.
But supremacy has a boundary that shows up again and again in modern constitutional law: Congress can regulate private actors, but it cannot commandeer states. It cannot order a state legislature to pass a law. It cannot order a governor, sheriff, or state agency to administer a federal regulatory program as a matter of federal command.
That boundary is called the anti-commandeering doctrine, and it is one of the most practical, day-to-day expressions of the Tenth Amendment and the Constitution’s structure. It explains why some federal statutes that read like direct commands to states get struck down, while other statutes survive by using federal enforcement, grants, incentives, and conditional funding.
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The simple idea
The anti-commandeering doctrine is the rule that Congress cannot require states to use their lawmaking or executive machinery to carry out federal policy.
There are two core versions of the ban:
- No commandeering state legislatures: Congress cannot force a state to enact, keep, or repeal specific laws.
- No commandeering state executives: Congress cannot force state officers to administer or enforce federal regulatory programs.
This does not mean the federal government is weak. It means it must use its own tools: federal agencies, federal officers, federal courts, federal money, and the power to regulate private conduct directly.
Where it comes from
The doctrine is often described as a Tenth Amendment rule, but it is really about the Constitution’s design.
1) Enumerated powers
Congress has specific powers listed in Article I. States retain general “police powers” over health, safety, and welfare. Anti-commandeering reinforces that division: if Congress wants a program enforced, it cannot treat state governments as convenient field offices. In doctrinal terms, the question is not whether Congress has a goal, but whether it has the constitutional authority to make states implement that goal.
2) Accountability
There is also a democracy problem. If Washington can compel state officials to implement federal policy, voters get confused about who to blame and who to reward. Anti-commandeering forces the federal government to own its choices and its enforcement.
3) Supremacy still matters
Supremacy means valid federal law overrides conflicting state law. In plain terms, preemption is when federal rules displace conflicting state rules for everyone subject to the law. Supremacy does not mean Congress can draft state government into federal service. Federal law can preempt, but it cannot conscript.
The key cases
The Supreme Court built the modern anti-commandeering doctrine in a line of cases. Two of them, Printz and Murphy, are the ones you see in today’s disputes.
New York (1992)
New York v. United States involved a federal scheme for dealing with low-level radioactive waste. One provision effectively gave states a “choice” that was not really a choice: either take title to the waste (and the liabilities) or regulate according to Congress’s instructions.
The Court said Congress cannot commandeer state legislatures. It can encourage states, and it can preempt state laws, but it cannot issue a legislative ultimatum: “Pass this law or else.”
Printz (1997)
Printz v. United States involved the Brady Handgun Violence Prevention Act’s interim background check system. While the national system was being built, the law required local chief law enforcement officers to perform certain tasks for handgun purchases.
The Court struck that requirement down. Even if the federal policy goal is lawful, Congress cannot compel state executive officials to administer a federal regulatory program. Put more precisely, Congress must execute federal law through federal officers, or regulate private parties directly, rather than issuing direct orders to state executive personnel.
Murphy (2018)
Murphy v. NCAA involved federal restrictions on state-authorized sports betting. Instead of regulating gambling directly, the federal law told states they could not “authorize” sports gambling.
The Court held that this too violates anti-commandeering. A federal statute cannot dictate what a state legislature may or may not enact. The fact that the federal command was framed as “you may not legalize” did not save it. A prohibition aimed at state lawmaking is still a command to the state.
What it is not
Because the doctrine gets invoked in political arguments constantly, it helps to be clear about what it does not do.
Not a permission slip
A state cannot nullify valid federal law. If Congress validly regulates private actors, states cannot block that regulation just by disagreeing.
Not a ban on cooperation
States can cooperate with federal enforcement. They can sign agreements, share information when allowed, and accept funding with conditions. The doctrine is about compulsion, not voluntary partnership.
Not a stop sign for preemption
Congress can preempt state laws that conflict with federal law. Preemption changes what rules apply to private conduct. Commandeering changes who must run the program. Those are different constitutional moves.
Adjacent rules
To keep the doctrine from being overstated, it helps to name a few nearby principles that often get confused with commandeering.
State courts and federal claims
Anti-commandeering is mainly about state legislatures and state executives. State courts are a different story. Under the Supremacy Clause and cases like Testa v. Katt, state courts generally must hear federal causes of action when they have jurisdiction and do not discriminate against federal law.
Generally applicable federal laws
Congress sometimes may regulate states without “commandeering” them, especially through generally applicable rules that regulate states as participants in an activity rather than ordering them to govern. For example, in Reno v. Condon (2000), the Court upheld the Driver’s Privacy Protection Act, which restricted how states could disclose driver data.
Conditional preemption
Another common pattern is conditional preemption: Congress sets a federal standard and lets states choose whether to regulate to meet it. If a state declines, federal law preempts and the federal government (or federally approved private enforcement mechanisms, depending on the statute) supplies the rule. The point is choice backed by preemption, not an order to legislate.
How Congress gets help
If Congress cannot order states around, how do so many federal programs end up administered by state agencies?
One answer is cooperative federalism, a model where the federal government sets national standards and invites states to implement them, usually with funding attached.
Spending power
Under Congress’s spending power, it can offer money to states and set conditions on how that money is used. States can say yes or no. If they say yes, the conditions become part of the deal.
Classic doctrine (often associated with South Dakota v. Dole) asks whether funding conditions are stated clearly, relate to the federal program, do not require constitutional violations, and do not cross the line into coercion.
That is why highways, education funding, environmental programs, and large parts of health policy often run through state governments. Washington pays, states administer, and both sides get something they want.
No gun to the head
There is a constitutional limit: the offer cannot be so extreme that states have no real choice. In NFIB v. Sebelius (2012), the Court said Congress went too far when it threatened to take away existing Medicaid funding if states refused to expand Medicaid. In doctrinal terms, the problem is coercion, not mere pressure.
Modern flashpoints
Immigration is one of the clearest places to see anti-commandeering arguments in public life, because it sits at the intersection of federal supremacy and local law enforcement realities.
What the federal government can do
- Congress can fund federal immigration agencies and authorize federal officers to enforce federal immigration law.
- The federal government can regulate employers, visa holders, and other private actors directly.
- Congress can create voluntary cooperation programs with states and localities and attach conditions to federal grants, within constitutional limits.
- Congress can preempt state and local measures that conflict with valid federal immigration rules, depending on the statute and the kind of conflict.
What the federal government cannot do
Anti-commandeering means Congress generally cannot force state and local officers to perform federal immigration enforcement duties as a matter of direct federal command.
That said, readers should be careful not to treat every immigration-related “information sharing” dispute as automatically resolved by anti-commandeering. Litigation around statutes like 8 U.S.C. § 1373 has turned on how a law is structured, whether it is framed as a restriction versus an affirmative duty, and how it interacts with preemption and funding conditions. The doctrine supplies a framework, not an automatic answer.
That is why many fights turn on the difference between requiring participation versus conditioning benefits or regulating private conduct.
Why the disputes persist
These conflicts often involve overlapping questions:
- Preemption: Does federal law displace the state or city rule?
- Commandeering: Is the federal government trying to force state or local officials to act?
- Funding conditions: Is a grant condition valid, clearly stated, related to the program, and non-coercive?
It is easy for public debate to mash these into one argument about who is “allowed” to do what. Constitutionally, they are distinct lanes.
A quick test
When you see a headline about a state refusing to help with a federal initiative, ask three questions.
- Is Congress regulating private actors directly? If yes, supremacy and preemption do most of the work.
- Is Congress ordering the state legislature to enact or keep a law? That is the New York and Murphy problem.
- Is Congress ordering state officers to administer or enforce a federal program? That is the Printz problem.
If the federal government is offering money with conditions instead of issuing orders, you are usually in cooperative federalism territory, and the fight becomes about notice, fit, and coercion.
Why it matters
Anti-commandeering is not just a states’ rights slogan. It is a structural rule that shapes how power is exercised in a country with two sovereigns operating at once.
It forces the federal government to do something the Constitution repeatedly demands: take responsibility for federal policy with federal resources. If Congress wants a national program, it can build one. It just cannot draft state governments into doing the work and then call that “federalism.”
And for citizens, that clarity matters. When enforcement fails, or succeeds, you should be able to tell who owns the outcome. Anti-commandeering is one of the doctrines that tries to keep that line visible.